I have serious vibration issue on my car, Acura TLX 2017 2.4L i4 + DCT, tech package. (same engine with Honda CR-V 2015 and 2016)

Irritating vibration arises under next conditions: 1. At idle, when the engine RPM drops to around 600 RPM (stop at a signal, etc.) 2. In Drive mode (in P or N mode, it goes back to around 700 RPM)

I visited two different Acura dealers, and both said the vibration was perfectly normal for Acura. For comparison, the vibration level on my car is a lot worse than that of a 10-year old Lexus, and it is ridiculous to 'see' the vibrating passenger-side seat whenever I stop at a signal.

Everyone will perceive vibration level differently, so I collected scientific data (acceleration values) to show the seriousness of the vibration objectively: acceleration values at 600 RPM became FIVE TIMES LARGER than those at 700 RPM! (Please see the attached PNG file for the details)

Honda at least acknowledged the vibration issue on their most important model CR-V (2015/16) with the same 2.4L engine, but they refuse to deal with the issue on less lucrative models like TLX.

What I ask Honda/Acura is quite simple: if they cannot provide a good solution to this issue, please set the minimum RPM to 700 RPM. That is all I ask.